贵州南部紫页1井威宁组沉积微相特征及其沉积演化

发布时间：2018-06-26 23:57

本文选题：紫页井 + 威宁组　；参考：《中国岩溶》2017年03期

【摘要】：贵州南部紫云地区的威宁组以台地边缘藻丘沉积为主要特征。紫页1井钻孔岩芯显示:威宁组总体由台地边缘礁(丘)向局限台地、开阔台地过渡的海退进积层序,其间包括台地边缘藻(丘)、局限台地、开阔台地三个亚相,发育生物粘结岩(SMF7)、有骨屑颗粒的生屑灰泥质颗粒石灰岩/颗粒质灰泥石灰岩(SMF10)、核形石砾屑碳酸盐岩/颗粒灰岩(SMF13)、集合颗粒灰岩微相(SMF17)、均质无生物泥晶灰岩微相(SMF23)、岩屑漂浮岩/砾屑碳酸盐岩/角砾岩微相(SMF24)六个微相;威宁组的沉积充填序列由六个岩性组合基本相同、沉积环境、沉积微相特征大致相似的沉积旋回构成。每一个沉积旋回均以台地边缘礁(丘)相的藻凝块灰岩为主体,向上则渐变为局限台地、开阔台地相的生物碎屑灰岩,表明威宁组至少经历了六次海平面升降变化过程;威宁组的出现代表了罗甸—水城北西向槽盆边缘斜坡相的打屋坝组富有机质泥页岩的终结。
[Abstract]:The Weining formation in Ziyun area of southern Guizhou is characterized by algae-dune deposition on the platform margin. The core of the borehole in well Ziping1 shows that the Weining formation generally transits from the terrace edge reef (mound) to the restricted platform, and the open platform transits from the sea back to the accumulation sequence, which includes the terrace marginal algae (mound), the restricted platform, the open platform three subfacies, Biologically bonded rock (SMF7), metamorphic marlite / granular marl limestone (SMF10), carbonatite / granular limestone (SMF13), aggregate granular limestone microfacies (SMF17), homogenous actinite microfacies (SMF23), bioclastic granulite (SMF10), metamorphic conglomerate carbonate / granular limestone (SMF13), and homogenous actinite microfacies (SMF23). Lithic floating rock / gravel carbonate / breccia microfacies (SMF24) six microfacies; The sedimentary filling sequence of the Weining formation is composed of six lithologic assemblages, similar sedimentary environment and similar sedimentary microfacies characteristics. Each sedimentary cycle is dominated by algal agglomerate limestone in the reef (hilly) facies of the platform margin, and gradually changed into the bioclastic limestone of the limited platform and open platform facies, indicating that the Weining formation has experienced at least six sea level rise and fall processes. The appearance of Weining formation represents the end of organic matter-rich shale of Dawuba formation with the slope facies of Luodian-Shuicheng NW trench basin margin.
【作者单位】：贵州省地质调查院;中国地质科学院岩溶地质研究所;
【基金】：中国地质调查局油气资源调查中心《南方地区1∶5万页岩气基础地质调查》子项目《贵州晴隆地区1∶5万页岩气地质调查》(12120115102001) 西南岩溶区1∶5万地质填图试点项目(DD20160061)
【分类号】：P512.2;P618.13

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